Bolt-threading machine.



No. 637,772. Patented Nov.r28,' |899.

H. P. EILEns. BOLT THREADING MACHINE. (Apph to mea Feb 2s 189s) 2 Sheets-Sheet I.

W/TNESSES 4 //v VENTO/f BY m A TToH/VE y.

No.'637,7,72. Patented Nov. 2a, |899.

H. P. mums.

BOLT .THREADING MACHINE.

(Application med Feb. 26, 1898.)

` (No Model.) 2 Sheets-:Sheet 2.

W/TNESSES f A TTOHNEY.

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UNITED STATES.

PATENT OFFICE.

HIO P. EILERS, OF CLEVELAND, OHIO.

BOLT-TH READING MACHINE.

SPECIFICATION forming part of Letters Patent No. 637,772, dated November 28, 1899.

Application led February 26,1898. Serial No. 671,806. (No model.)

To all whom t may concern:

Be it known that I, H10 P. EILERS, a citizen of the United States,V and a resident of Cleveland, count-y of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Bolt-Threading Machines, of which the following is a specification, the principle of the invention being herein explained and the best Inode in which I have contemplated applying that principle, so as to distinguish it from other inventions. Y

My invention has for its object the improvement of threading-heads of bolt-threading machines; and it consists of means hereinafter fully described.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used. j

In said annexed drawings, Figure I represents a perspective view of my improved threading-head. Fig. II represents a crosssection taken upon the axial plane indicated by line 2 2 in Fig. I. Fig. III represents a crosssection taken upon the axial plane indicated by the said line 2 2, illustrating the relative position of the parts when the head is open. Fig. IV represents a cross-section taken upon the axial plane indicated by line 4 e in Fig. I, showing portions of the mechanism in elevation. Fig. V represents a sectional view taken upon the axial plane indicated by said line 4. 4, showing the relation of the parts when said parts are in the position shown in Fig. III. Figs. VI, VII, VIII, IX, and X are detail views.

The barrel A is formed with a longitudinal bore a and an end flange a', by means of which it may be secured to the rotating spindle of the threading-machine. Four radial slots a2 are cut in the end of said barrel, Fig. X, the distance from each other of whose centers is ninety degrees. In each lateral face of each slot are cut two tongues d3, Figs. II, III, and X.

Four slides or die-holders B, Figs. VI and IX, are each of a thickness such as to'cause them to snugly slide into the slots ai and are formed on each lateral face with two grooves b, adapted to receive the tongues di.

The

grooves are both formed nearer one end of the slide than the other, whereby the latter when in position in the slots are caused to project beyond the end of the barrel. The slides are thus held rigidly against displacement in either direction of the barrel-axis and are capable of radial retraction only. The outer end face b of each slide is inclined with reference to the face opposite, such inclination being toward the inner end of each slide. An undercut or inverted T-groove b2 is formed in each slide parallel with and cut from the middle of the inclined face thereof.

AIn the outer lateral end b3 of each slide is cut a groove b4, into each of which tits a cutter or die O, which is removably secured by means of a set-screw B', threaded in a bushing b5, suitably secured in the slide.

Bearing upon and projecting beyond the end of the barrel is a die-ring D, upon whose inner surface are secured four tongues D of T cross-section and distant from each other ninety degrees. Said tongues are given an inclination equal to that of the T-grooves in the slide and made to iit and slide in said grooves. The ring may hence be slipped upon the barrel and the tongues caused to engage the grooves, whereby the retraction of the ring will cause the said slides to radially retract toward and from the barrel-axis. The inner projecting surface is of beveled or inclined formation, as shown in Fig. IV. Diametrieally opposite each other, nearer the opposite end of the barrel, are formed or secured two racks E. A retractable sleeve F has sliding bearing upon said barrel and is formed with grooves f, whereby it may pass said racks. Said sleeve has formed upon it two pairs of lugs f', in each pair of which is secured a pin journaling one arm g of a toggle G. Said toggle-arm has formed upon it concentric with its bearing a set of gear-teeth forming a segment g', meshing with the rack E. The opposite end of the toggle is journaled upon a screw-bolt H, which is screwed into an elongated nut J, having an outer thread whose trend is in a direction opposite that of the inner thread. Said nuts are screwed into threaded bores diametrically opposite cach other in the die-ring. When the sleeve F, and hence the toggle-arm bearing,is retracted to the right from the position shown in Fig.

IOO

causing it also to retract to the right, and,

hence radially retract and open the dies themselves, such operation taking place when it is desired to release abolt upon which a thread has been cut. The relation of the parts when the dies are open is illustrated in Figs'.` III and V, and it will be seen that a given linear movement on the part of the sleeve produces more than twice the same amount oi'lnovement in the-die-ring by virtue of the cycloidal movement imparted. to the toggle. This feature permits the yuse of adegree of inclina-l tion in the grooves b2 of the slides less'than that which would otherwise be required `to cause a given amount of opening movement on the part of the dies for a given amount of movement on the'part ofthe sleeve. The inclinationbeingthus less, it is obvious that a nicer adjustment of the dies may be obtained.'

.. the barrel, as shown, and a line m m, drawn through the center of the left -hand pin through the center oi' the middle pin, will intersect the pitch-line of the teeth of the gear and rack perpendicularly below the center of` saidgear. The toggle when in this position is eectually locked., vand the trend of the threads on the inside and outside of` the adjusting-nut being in vopposite directions it is seen that it is impossible for the nut to turn itself through the pressure ofthe work or jar of the machine, and hence change the'posi tion of the dies, so .that while the thread is being cut the dies are absolutely rigid and independent of-any jars which would tend to alter the relation of the parts; but when the thread is ot being cut it is possible to adjust the nut at any time, and the turning of the tion between the said' sleeve and the die-ring nut will produce a corresponding movement of the die-ring, which hence alters the rela?,

and the dies heldtherein.

j The slides projecting beyond the end of thev face of the slide .holdingsuch die when in the position shown in Fig. I, saidring thereby forming a support or backing to receive radial outward thrusts exerted upon the-dies' during the cutting operation. This construction prevents the slide from binding in the grooves'in the barrel end, so that on the coinpletion ofthe cutting operation the dies may be easily withdrawn from the threads. The outer lateral-face of each slide isifree, and hencethe outer lateral face of each die may be free. U The sides of the slides being free, as described, the chips form ed during the c utting operation find a free exit between the slides,` and hence the possibility ofV clogging up the inside of the head is avoided. The inner surface of the die-ring being beveled, as described and shown, the chips are not permitted to remain inthe die-throat, but are `discharged from the ring as soon as they drop upon it, thus still further contributing to the freedom from damage by the cloggingor interference of. the chips. The outer lateral face of the die being free, it is seen-that it is possibleto bring the said dies completely up under the head of -the bolt upon which a kthread is being cut. Y

Itis very essential that the groove b? be formed and the tongue D be secured to the parts as shown, inasmuch as a reversal of the arrangement-that is, securing thetongue to the slide and forming the groove in said ringwould necessitate a crossing of grooves in the slides, resulting inY a disastrous destructive action on the part of the sharp corners so formed. My improvement hence combines vthe advantages of nicety of adjustment, absolute rigidity of part`s during the cutting operation, freenessfrm clogging, ability to cut a thread throughout the entire length of IOO a'bolt, and simplicity of construction with- Vout unduly increasing its size.

Inasmuch as the dies themselvesare independent of and removable from the slides, the black stock may be used, thus eliminating expense occasioned by dressing and nishing the hard die-steel, an item Y of considerable economical importance in the construction of `bolt-threading machinery.

. Other modes of applying the principle of v my invention may be employed instead of the one explained, change being made as regards l themechanism herein disclosed,provided the means coveredv by any one of 'the following claims be employed. Y

I therefore particularly point out and distinctly-claim as my invention- 1. In abolt-threading machine, the combination of a barrel, slides fitted in and projecting from the end of said barrel and provided with dies in said projecting portion, and supporting means, said slides having a bearingsurface for engaging said supporting means, said surface intersecting a plane perpendicular to the barrel-axis and passing through the outer end portion of such die, substantially as set forth. A Y Y 2. In a bolt-threading machine, the combination of a barrel, die-holding slides fitting in the end of said barrel and engaging said barrel in tongue-and-grooved formation, support `ing means, said slides provided with an undercut groove for engaging a tongue having IIO a cross-section similar to the groove cross-section and secured to said supporting means, substantially as set forth.

3. In a bolt-threading machine. the combination of a barrel, slides fitting in and radially retractable in said barrel, and a supporting ring projecting beyond the barrel end, the inner projecting surface of said ring having a beveled or inclined formation intermediate of said slides, substantially as set forth.

4c. In a bolt-threading machine, the combination of means for retractin g the dies, means for operating said retracting means, said operating means having a cycloidal movement, and means for actuating said operating means, substantially as set forth.

5. In a bolt-threading machine, the combination of means for retracting the dies, a toggle for operating said retracting means, said toggle having a cycloidal movement, and means for actuating said toggle, substantially as set forth.

6. In a bolt-threading machine, the combination of means for retracting the dies, means for operating said retracting means, means for actuating said operating means and means for imparting to said operating means a cycloidal movement, substantially as set forth.

7. In a bolt-threading machine, the combination 'of means for retracting the dies, a toggle for operating said retracting means, means for actuating said toggle and means for imparting to said toggle a cycloidal movement, substantially as set forth.

8. In a bolt-threading machine, the combination of means for retractin g the dies, a

toggle for operating said retracting means, said toggle j ournaled solely on said retracting means and on a retractable bearing,and means for imparting a rotarv movement to one of said toggle-arlns whereby the toggle has imparted to it a cycloidal movement, substantially as set forth.

9. In a bolt-threading machine, the combination of means for retracting the dies, a toggle for operating said retracting means, one end of said toggle secured to said retracting means and the other journaled on a retractable bearing said journaled end formed with gear-teeth, and a rack engaging said gear-teeth, whereby said journaled arm is given a rotary movement When said bearing is retracted thereby imparting a cycloidal movement to said toggle, substantially as set forth.

10. In a bolt-threading machine, the combination of Vmeans for retracting the dies, means for operating said retracting means, and means for adjusting the relation of said retracting and operating means, such adjusting means consisting of a nut adapted to be screwed into the retracting means and provided with a threaded bore adapted to re ceive the connecting portion of said operating means, the trend of the inner and outer threads beingin opposite directions, substantially as set forth.

Signed by me this 24th day of February,

I-I. P. EILERS. Attest:

A. E. MERKEL, D. T. DAvIEs. 

